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Alzheimer's disease tends to develop slowly and gradually worsen over several years. Eventually, Alzheimer's disease affects most areas of the brain. Memory, thinking, judgment, language, problem-solving, personality and movement all can be affected by the disease.

There are generally five stages associated with Alzheimer's disease:

• Preclinical Alzheimer's disease.
• Mild cognitive impairment due to Alzheimer's disease.
• Mild dementia due to Alzheimer's disease.
• Moderate dementia due to Alzheimer's disease.
• Severe dementia due to Alzheimer's disease.

Dementia is a term used to describe a group of symptoms that affect intellectual and social abilities enough to interfere with daily activity.

The five Alzheimer's stages can help you understand what might happen. But it's important to know that stages are only rough generalizations. The disease is a continuous process. Each person has a different experience with Alzheimer's and its symptoms.